Process and Equipment for Blast Furnace Ironmaking Using Pure Oxygen and Gas

ABSTRACT

Process and equipment for blast furnace ironmaking using pure oxygen and gas The process for blast furnace ironmaking using pure oxygen and gas includes putting a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with coke of 170-200 kg; blasting pure oxygen into the furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm 3 , and ejecting gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein the gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa; purifying and cooling the gas produced in the reducing reaction, and transmitting the gas into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use. By using the above process of the present invention, the blast furnace productivity is tremendously increased. The blast furnace productivity is up to 6-8 ton iron/m 3 *D, the solvent consumption is reduced by two-thirds, the slag amount is reduced by two-thirds, the comprehensive consumption of iron of each ton is up to 492 kgCE/t, and the furnace top gas can be recycled to generate power.

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to a process of blast furnace ironmaking in iron and steel metallurgy industry, and more particularly to an ironmaking process that replaces blast furnace blasting with pure oxygen, and replaces most of the coke with blasting preheated gas containing hydrogen.

2. Description of Related Arts

At present, three-quarters pig iron and molten iron for steelmaking is produced by traditional blast furnace ironmaking process. The recent traditional blast furnace ironmaking process has been highly developed due to the use of new technology such as high oxygen, coal injection, large-scale and so on.

Due to the development of pure water-gas technique as disclosed in China patent CN 200610045968.1 and reforming technique of gas, coke oven gas and natural gas, the industrial process for producing high quality, high purity, high hydrogen and low cost reducing gas has been mature, so that the blast furnace ironmaking process using pure oxygen and the above mentioned gas as primary reducing matter can be realized.

The process and equipment for blast furnace ironmaking using pure oxygen and gas that takes gas as a reducing matter and replaces preheated blast with pure oxygen, has not been found after a thorough search.

SUMMARY OF THE PRESENT INVENTION

An object of the present invention is to provide a process and equipment for blast furnace ironmaking using pure oxygen and gas, which modifies the traditional blast furnace ironmaking process and equipment.

Accordingly, in order to accomplish the above object, the present invention provides a process for blast furnace ironmaking using pure oxygen and gas includes the following processes:

1. Put a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with coke of 170-200 kg;

2. Blast pure oxygen into the furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm³, and eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein the gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa;

3. Purify and cool the gas produced in the reducing reaction, and transmit the gas into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.

An equipment for blast furnace ironmaking using pure oxygen and gas comprises a feeding device, a blast furnace, a gravity dust collector, a ceramic tube type dust collector, a bag dust collector, a carbon dioxide pressure swing absorption device, and a residual pressure power generation device, wherein the blast furnace comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at the periphery of the bosh thereof, and a ball type hot blast stove for preheating gas provided outside the blast furnace, wherein the ball type hot blast stove is communicated with the plurality of gas ejecting nozzle members provided at the periphery of the bosh of the blast furnace via tubes; a gas explosion-proof safety device is mounted on the tube at an outlet terminal of the ball type hot blast stove; the plurality of oxygen ejecting nozzle members provided at the bosh of the blast furnace are communicated with oxygen source via tubes.

The gas produced in the reaction of the present invention is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.

By using the above process of the present invention, the blast furnace productivity is tremendously increased. The blast furnace productivity is up to 6-8 ton iron/m³*D, the solvent consumption is reduced by two-thirds, the slag amount is reduced by two-thirds, the comprehensive consumption of iron of each ton is up to 492 kgCE/t, and the furnace top gas can be recycled to generate power.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system diagram of an equipment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Example I

A process for blast furnace ironmaking using pure oxygen and gas:

Put pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with 180 kg coke; then blast pure oxygen into the furnace, and at the same time eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein each ton of molten iron is blasted with 130 Nm³ oxygen, and the gas is preheated and pressured up to 1000° C.-1100° C. and 0.2 MPa respectively. The gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.

An equipment for blast furnace ironmaking using pure oxygen and gas comprises a feeding device 1, a blast furnace 2, a gravity dust collector 4, a ceramic tube type dust collector 5, a bag dust collector 6, a carbon dioxide pressure swing absorption device 7, and a residual pressure power generation device 8, wherein the blast furnace 2 comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at the upper and lower side of the bosh thereof, and comprises a gas coiled tube 9 and an oxygen coiled tube 3 provided at the periphery of the both thereof, wherein a plurality of gas ejecting nozzle members have a plurality of branch tubes respectively that communicate with the gas coiled tube 9, and a plurality of oxygen ejecting nozzle members have a plurality of branch tubes respectively that communicate with the oxygen coiled tube 3. A ball type hot blast stove 11 for preheating gas is provided outside the blast furnace 2, wherein the ball type hot blast stove 11 is communicated with the gas coiled tube 9 via a gas tube 12, and a gas explosion-proof safety device 10 is mounted on the gas tube 12.

Example II

A process for blast furnace ironmaking using pure oxygen and gas:

Put pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with 190 kg coke; then blast pure oxygen into the furnace, and at the same time eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein each ton of molten iron is blasted with 160 Nm³ oxygen, and the gas is preheated and pressured up to 1000° C.-1100° C. and 0.3 MPa respectively. The gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.

Example III

A process for blast furnace ironmaking using pure oxygen and gas:

Put pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with 200 kg coke; then blast pure oxygen into the furnace, and at the same time eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein each ton of molten iron is blasted with 190 Nm³ oxygen, and the gas is preheated and pressured up to 1000° C.-1100° C. and 0.5 MPa respectively. The gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use. 

1. A process for blast furnace ironmaking using pure oxygen and gas, comprising: (a) putting a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into a furnace from a furnace top, wherein each ton of iron is assigned with coke of 170-200 kg; (b) blasting pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm³, and ejecting gas that is pressured and preheated by a ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa; and (c) purifying and cooling said gas produced in reducing reaction, and transmitting said gas into a residual pressure power generation device via tubes for being reused and is recovered into a gas cylinder or recycled for use.
 2. An equipment for blast furnace ironmaking using pure oxygen and gas, comprising: a feeding device, a blast furnace, a gravity dust collector, a ceramic tube type dust collector, a bag dust collector, a carbon dioxide pressure swing absorption device, and a residual pressure power generation device, wherein said blast furnace comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at a periphery of a bosh thereof, and a ball type hot blast stove for preheating gas provided outside said blast furnace, wherein said ball type hot blast stove is communicated with said plurality of gas ejecting nozzle members provided at said periphery of said bosh of said blast furnace via tubes; a gas explosion-proof safety device is mounted on a tube at an outlet terminal of said ball type hot blast stove; said plurality of oxygen ejecting nozzle members provided at said bosh of said blast furnace are communicated with oxygen source via tubes.
 3. The process for blast furnace ironmaking using pure oxygen and gas as recited in claim 1, wherein put said mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into said furnace from said furnace top, wherein each ton of iron is assigned with coke of 190 kg; blast pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 160 Nm³, and eject gas that is pressured and preheated by said ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 1000° C. to 1100° C. and to a pressured up to 0.3 MPa; and purify and cool said gas produced in reducing reaction, and transmit said gas into said residual pressure power generation device via tubes for being reused and is recovered into said gas cylinder or recycled for use.
 4. The process for blast furnace ironmaking using pure oxygen and gas as recited in claim 1, wherein put said mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into said furnace from said furnace top, wherein each ton of iron is assigned with coke of 200 kg; blast pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 190 Nm³, and eject gas that is pressured and preheated by said ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 1000° C. to 1100° C. and to a pressured up to 0.5 MPa; and purify and cool said gas produced in reducing reaction, and transmit said gas into said residual pressure power generation device via tubes for being reused and is recovered into said gas cylinder or recycled for use. 